Oakland Raiders release guard Mike Brisiel

The Raiders released veteran guard Mike Brisiel on Tuesday in a move that clears the way for recently acquired Austin Howard to take over at right guard.

Brisiel, 31, started 15 games each of the past two seasons, his lone two years with the Raiders. He was one of general manager Reggie McKenzie's most high-profile signings in his first year running the Raiders football operations.

Brisiel is latest player caught up in the Raiders' offensive line overhaul. The first change came when left offensive tackle Jared Veldheer bolted for the Arizona Cardinals in free agency.

The Raiders then kicked into high gear by signing Howard, offensive tackle Donald Penn and guard/center Kevin Boothe.

Penn is projected as the replacement for Veldheer. Coach Dennis Allen said that the Raiders intend to take a look at Howard at right guard. Boothe is expected to compete for the starting job at left guard.

In all, center Stefen Wisniewski might be the lone returning starter, unless Khalif Barnes beats out second-year player Menelik Watson for the right offensive tackle vacancy.

Cutting Brisiel also frees up about $1.4 million in salary-cap room for 2014, which gives the Raiders even more flexibility to add more free agents to the haul they amassed the first three weeks of free agency.